Updated all plugins that are non-forked. Added some new plugins.

Added update_plugins.py which can fetch new plugins from GitHub.

New plugins added: zencoding, vim-indent-object, taglist, nginx.vim

sources_non_forked/vim-less/ftplugin/less.vim

@@ -12,11 +12,13 @@ let b:did_ftplugin = 1
 
 let b:undo_ftplugin = "setl cms< def< inc< inex< ofu< sua<"
 
+setlocal iskeyword+=-
 setlocal commentstring=//\ %s
 setlocal define=^\\s*\\%(@mixin\\\|=\\)
 setlocal includeexpr=substitute(v:fname,'\\%(.*/\\\|^\\)\\zs','_','')
 setlocal omnifunc=csscomplete#CompleteCSS
 setlocal suffixesadd=.less
+setlocal comments=s1:/*,mb:*,ex:*/
 
 let &l:include = '^\s*@import\s\+\%(url(\)\=["'']\='